Why is it important not to add to the gospel?

Adding to the gospel distorts the core message of salvation by grace alone through faith alone, effectively undermining the completed work of Christ. This is highlighted in Galatians 1:6-8, where Paul warns against receiving any gospel that deviates from the one he preached. Such additions can lead to a perversion of grace, suggesting that human works or merits play a role in our salvation. It's essential to preserve the integrity of the gospel as a complete and perfect revelation of truth, ensuring that all glory remains with Christ, the sole author of salvation. The integrity and purity of the gospel are vital for the health of the church and the assurance of believers.